Since redesigning our site a short while ago, we decided to add Cufon to make thing look a little nicer. Cufon is a javascript based code that transforms the boring standard web fonts into any font you can get your hands on.
So after installing Cufon, we noticed that when the page was loading we saw a 1 or 2 second snapshot of the boring standard font before the page then went on to render the Cufon font. This obviously did not look good, so after scouring the internet we found this easy fix that works a charm.
You simply have to add the following line into your css file, and the delay rendering issue is fixed!
.cufon-loading { visibility: hidden; }